The Forney 60190 1-inch by 1-inch mounted flap wheel features durable, high-grade aluminum Oxide coating for aggressive cleaning and refinishing on most wood or metal surfaces. Ideal for mounting on power drills or other chuck driven machines. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5, 000 products for the hardware, automotive, farm and ranch and Do-It-Yourself markets. 1-Inch (25.4 mm) by 1-inch (25.4 mm) with 1/4-inch (6.35 mm) shank mounted flap wheel. 60 Grit. 30, 000 max RPM. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.